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Linux/net/dccp/dccp.h

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  1 #ifndef _DCCP_H
  2 #define _DCCP_H
  3 /*
  4  *  net/dccp/dccp.h
  5  *
  6  *  An implementation of the DCCP protocol
  7  *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  8  *  Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
  9  *
 10  *      This program is free software; you can redistribute it and/or modify it
 11  *      under the terms of the GNU General Public License version 2 as
 12  *      published by the Free Software Foundation.
 13  */
 14 
 15 #include <linux/dccp.h>
 16 #include <linux/ktime.h>
 17 #include <net/snmp.h>
 18 #include <net/sock.h>
 19 #include <net/tcp.h>
 20 #include "ackvec.h"
 21 
 22 /*
 23  *      DCCP - specific warning and debugging macros.
 24  */
 25 #define DCCP_WARN(fmt, ...)                                             \
 26         net_warn_ratelimited("%s: " fmt, __func__, ##__VA_ARGS__)
 27 #define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
 28                                          __FILE__, __LINE__, __func__)
 29 #define DCCP_BUG(a...)       do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0)
 30 #define DCCP_BUG_ON(cond)    do { if (unlikely((cond) != 0))               \
 31                                      DCCP_BUG("\"%s\" holds (exception!)", \
 32                                               __stringify(cond));          \
 33                              } while (0)
 34 
 35 #define DCCP_PRINTK(enable, fmt, args...)       do { if (enable)             \
 36                                                         printk(fmt, ##args); \
 37                                                 } while(0)
 38 #define DCCP_PR_DEBUG(enable, fmt, a...)        DCCP_PRINTK(enable, KERN_DEBUG \
 39                                                   "%s: " fmt, __func__, ##a)
 40 
 41 #ifdef CONFIG_IP_DCCP_DEBUG
 42 extern bool dccp_debug;
 43 #define dccp_pr_debug(format, a...)       DCCP_PR_DEBUG(dccp_debug, format, ##a)
 44 #define dccp_pr_debug_cat(format, a...)   DCCP_PRINTK(dccp_debug, format, ##a)
 45 #define dccp_debug(fmt, a...)             dccp_pr_debug_cat(KERN_DEBUG fmt, ##a)
 46 #else
 47 #define dccp_pr_debug(format, a...)
 48 #define dccp_pr_debug_cat(format, a...)
 49 #define dccp_debug(format, a...)
 50 #endif
 51 
 52 extern struct inet_hashinfo dccp_hashinfo;
 53 
 54 extern struct percpu_counter dccp_orphan_count;
 55 
 56 void dccp_time_wait(struct sock *sk, int state, int timeo);
 57 
 58 /*
 59  *  Set safe upper bounds for header and option length. Since Data Offset is 8
 60  *  bits (RFC 4340, sec. 5.1), the total header length can never be more than
 61  *  4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
 62  *    - DCCP-Response with ACK Subheader and 4 bytes of Service code      OR
 63  *    - DCCP-Reset    with ACK Subheader and 4 bytes of Reset Code fields
 64  *  Hence a safe upper bound for the maximum option length is 1020-28 = 992
 65  */
 66 #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(uint32_t))
 67 #define DCCP_MAX_PACKET_HDR 28
 68 #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
 69 #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
 70 
 71 /* Upper bound for initial feature-negotiation overhead (padded to 32 bits) */
 72 #define DCCP_FEATNEG_OVERHEAD    (32 * sizeof(uint32_t))
 73 
 74 #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
 75                                      * state, about 60 seconds */
 76 
 77 /* RFC 1122, 4.2.3.1 initial RTO value */
 78 #define DCCP_TIMEOUT_INIT ((unsigned int)(3 * HZ))
 79 
 80 /*
 81  * The maximum back-off value for retransmissions. This is needed for
 82  *  - retransmitting client-Requests (sec. 8.1.1),
 83  *  - retransmitting Close/CloseReq when closing (sec. 8.3),
 84  *  - feature-negotiation retransmission (sec. 6.6.3),
 85  *  - Acks in client-PARTOPEN state (sec. 8.1.5).
 86  */
 87 #define DCCP_RTO_MAX ((unsigned int)(64 * HZ))
 88 
 89 /*
 90  * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4
 91  */
 92 #define DCCP_SANE_RTT_MIN       100
 93 #define DCCP_FALLBACK_RTT       (USEC_PER_SEC / 5)
 94 #define DCCP_SANE_RTT_MAX       (3 * USEC_PER_SEC)
 95 
 96 /* sysctl variables for DCCP */
 97 extern int  sysctl_dccp_request_retries;
 98 extern int  sysctl_dccp_retries1;
 99 extern int  sysctl_dccp_retries2;
100 extern int  sysctl_dccp_tx_qlen;
101 extern int  sysctl_dccp_sync_ratelimit;
102 
103 /*
104  *      48-bit sequence number arithmetic (signed and unsigned)
105  */
106 #define INT48_MIN         0x800000000000LL              /* 2^47     */
107 #define UINT48_MAX        0xFFFFFFFFFFFFLL              /* 2^48 - 1 */
108 #define COMPLEMENT48(x)  (0x1000000000000LL - (x))      /* 2^48 - x */
109 #define TO_SIGNED48(x)   (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x)))
110 #define TO_UNSIGNED48(x) (((x) >= 0)?        (x) :  COMPLEMENT48(-(x)))
111 #define ADD48(a, b)      (((a) + (b)) & UINT48_MAX)
112 #define SUB48(a, b)      ADD48((a), COMPLEMENT48(b))
113 
114 static inline void dccp_set_seqno(u64 *seqno, u64 value)
115 {
116         *seqno = value & UINT48_MAX;
117 }
118 
119 static inline void dccp_inc_seqno(u64 *seqno)
120 {
121         *seqno = ADD48(*seqno, 1);
122 }
123 
124 /* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */
125 static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2)
126 {
127         u64 delta = SUB48(seqno2, seqno1);
128 
129         return TO_SIGNED48(delta);
130 }
131 
132 /* is seq1 < seq2 ? */
133 static inline int before48(const u64 seq1, const u64 seq2)
134 {
135         return (s64)((seq2 << 16) - (seq1 << 16)) > 0;
136 }
137 
138 /* is seq1 > seq2 ? */
139 #define after48(seq1, seq2)     before48(seq2, seq1)
140 
141 /* is seq2 <= seq1 <= seq3 ? */
142 static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
143 {
144         return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
145 }
146 
147 static inline u64 max48(const u64 seq1, const u64 seq2)
148 {
149         return after48(seq1, seq2) ? seq1 : seq2;
150 }
151 
152 /**
153  * dccp_loss_count - Approximate the number of lost data packets in a burst loss
154  * @s1:  last known sequence number before the loss ('hole')
155  * @s2:  first sequence number seen after the 'hole'
156  * @ndp: NDP count on packet with sequence number @s2
157  */
158 static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp)
159 {
160         s64 delta = dccp_delta_seqno(s1, s2);
161 
162         WARN_ON(delta < 0);
163         delta -= ndp + 1;
164 
165         return delta > 0 ? delta : 0;
166 }
167 
168 /**
169  * dccp_loss_free - Evaluate condition for data loss from RFC 4340, 7.7.1
170  */
171 static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp)
172 {
173         return dccp_loss_count(s1, s2, ndp) == 0;
174 }
175 
176 enum {
177         DCCP_MIB_NUM = 0,
178         DCCP_MIB_ACTIVEOPENS,                   /* ActiveOpens */
179         DCCP_MIB_ESTABRESETS,                   /* EstabResets */
180         DCCP_MIB_CURRESTAB,                     /* CurrEstab */
181         DCCP_MIB_OUTSEGS,                       /* OutSegs */
182         DCCP_MIB_OUTRSTS,
183         DCCP_MIB_ABORTONTIMEOUT,
184         DCCP_MIB_TIMEOUTS,
185         DCCP_MIB_ABORTFAILED,
186         DCCP_MIB_PASSIVEOPENS,
187         DCCP_MIB_ATTEMPTFAILS,
188         DCCP_MIB_OUTDATAGRAMS,
189         DCCP_MIB_INERRS,
190         DCCP_MIB_OPTMANDATORYERROR,
191         DCCP_MIB_INVALIDOPT,
192         __DCCP_MIB_MAX
193 };
194 
195 #define DCCP_MIB_MAX    __DCCP_MIB_MAX
196 struct dccp_mib {
197         unsigned long   mibs[DCCP_MIB_MAX];
198 };
199 
200 DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
201 #define DCCP_INC_STATS(field)   SNMP_INC_STATS(dccp_statistics, field)
202 #define __DCCP_INC_STATS(field) __SNMP_INC_STATS(dccp_statistics, field)
203 #define DCCP_DEC_STATS(field)   SNMP_DEC_STATS(dccp_statistics, field)
204 
205 /*
206  *      Checksumming routines
207  */
208 static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb)
209 {
210         const struct dccp_hdr* dh = dccp_hdr(skb);
211 
212         if (dh->dccph_cscov == 0)
213                 return skb->len;
214         return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
215 }
216 
217 static inline void dccp_csum_outgoing(struct sk_buff *skb)
218 {
219         unsigned int cov = dccp_csum_coverage(skb);
220 
221         if (cov >= skb->len)
222                 dccp_hdr(skb)->dccph_cscov = 0;
223 
224         skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
225 }
226 
227 void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb);
228 
229 int dccp_retransmit_skb(struct sock *sk);
230 
231 void dccp_send_ack(struct sock *sk);
232 void dccp_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
233                          struct request_sock *rsk);
234 
235 void dccp_send_sync(struct sock *sk, const u64 seq,
236                     const enum dccp_pkt_type pkt_type);
237 
238 /*
239  * TX Packet Dequeueing Interface
240  */
241 void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb);
242 bool dccp_qpolicy_full(struct sock *sk);
243 void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb);
244 struct sk_buff *dccp_qpolicy_top(struct sock *sk);
245 struct sk_buff *dccp_qpolicy_pop(struct sock *sk);
246 bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param);
247 
248 /*
249  * TX Packet Output and TX Timers
250  */
251 void dccp_write_xmit(struct sock *sk);
252 void dccp_write_space(struct sock *sk);
253 void dccp_flush_write_queue(struct sock *sk, long *time_budget);
254 
255 void dccp_init_xmit_timers(struct sock *sk);
256 static inline void dccp_clear_xmit_timers(struct sock *sk)
257 {
258         inet_csk_clear_xmit_timers(sk);
259 }
260 
261 unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
262 
263 const char *dccp_packet_name(const int type);
264 
265 void dccp_set_state(struct sock *sk, const int state);
266 void dccp_done(struct sock *sk);
267 
268 int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp,
269                     struct sk_buff const *skb);
270 
271 int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
272 
273 struct sock *dccp_create_openreq_child(const struct sock *sk,
274                                        const struct request_sock *req,
275                                        const struct sk_buff *skb);
276 
277 int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
278 
279 struct sock *dccp_v4_request_recv_sock(const struct sock *sk, struct sk_buff *skb,
280                                        struct request_sock *req,
281                                        struct dst_entry *dst,
282                                        struct request_sock *req_unhash,
283                                        bool *own_req);
284 struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
285                             struct request_sock *req);
286 
287 int dccp_child_process(struct sock *parent, struct sock *child,
288                        struct sk_buff *skb);
289 int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
290                            struct dccp_hdr *dh, unsigned int len);
291 int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
292                          const struct dccp_hdr *dh, const unsigned int len);
293 
294 int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
295 void dccp_destroy_sock(struct sock *sk);
296 
297 void dccp_close(struct sock *sk, long timeout);
298 struct sk_buff *dccp_make_response(const struct sock *sk, struct dst_entry *dst,
299                                    struct request_sock *req);
300 
301 int dccp_connect(struct sock *sk);
302 int dccp_disconnect(struct sock *sk, int flags);
303 int dccp_getsockopt(struct sock *sk, int level, int optname,
304                     char __user *optval, int __user *optlen);
305 int dccp_setsockopt(struct sock *sk, int level, int optname,
306                     char __user *optval, unsigned int optlen);
307 #ifdef CONFIG_COMPAT
308 int compat_dccp_getsockopt(struct sock *sk, int level, int optname,
309                            char __user *optval, int __user *optlen);
310 int compat_dccp_setsockopt(struct sock *sk, int level, int optname,
311                            char __user *optval, unsigned int optlen);
312 #endif
313 int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
314 int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
315 int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
316                  int flags, int *addr_len);
317 void dccp_shutdown(struct sock *sk, int how);
318 int inet_dccp_listen(struct socket *sock, int backlog);
319 __poll_t dccp_poll(struct file *file, struct socket *sock,
320                        poll_table *wait);
321 int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
322 void dccp_req_err(struct sock *sk, u64 seq);
323 
324 struct sk_buff *dccp_ctl_make_reset(struct sock *sk, struct sk_buff *skb);
325 int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
326 void dccp_send_close(struct sock *sk, const int active);
327 int dccp_invalid_packet(struct sk_buff *skb);
328 u32 dccp_sample_rtt(struct sock *sk, long delta);
329 
330 static inline bool dccp_bad_service_code(const struct sock *sk,
331                                         const __be32 service)
332 {
333         const struct dccp_sock *dp = dccp_sk(sk);
334 
335         if (dp->dccps_service == service)
336                 return false;
337         return !dccp_list_has_service(dp->dccps_service_list, service);
338 }
339 
340 /**
341  * dccp_skb_cb  -  DCCP per-packet control information
342  * @dccpd_type: one of %dccp_pkt_type (or unknown)
343  * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1
344  * @dccpd_reset_code: one of %dccp_reset_codes
345  * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code)
346  * @dccpd_opt_len: total length of all options (5.8) in the packet
347  * @dccpd_seq: sequence number
348  * @dccpd_ack_seq: acknowledgment number subheader field value
349  *
350  * This is used for transmission as well as for reception.
351  */
352 struct dccp_skb_cb {
353         union {
354                 struct inet_skb_parm    h4;
355 #if IS_ENABLED(CONFIG_IPV6)
356                 struct inet6_skb_parm   h6;
357 #endif
358         } header;
359         __u8  dccpd_type:4;
360         __u8  dccpd_ccval:4;
361         __u8  dccpd_reset_code,
362               dccpd_reset_data[3];
363         __u16 dccpd_opt_len;
364         __u64 dccpd_seq;
365         __u64 dccpd_ack_seq;
366 };
367 
368 #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
369 
370 /* RFC 4340, sec. 7.7 */
371 static inline int dccp_non_data_packet(const struct sk_buff *skb)
372 {
373         const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
374 
375         return type == DCCP_PKT_ACK      ||
376                type == DCCP_PKT_CLOSE    ||
377                type == DCCP_PKT_CLOSEREQ ||
378                type == DCCP_PKT_RESET    ||
379                type == DCCP_PKT_SYNC     ||
380                type == DCCP_PKT_SYNCACK;
381 }
382 
383 /* RFC 4340, sec. 7.7 */
384 static inline int dccp_data_packet(const struct sk_buff *skb)
385 {
386         const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
387 
388         return type == DCCP_PKT_DATA     ||
389                type == DCCP_PKT_DATAACK  ||
390                type == DCCP_PKT_REQUEST  ||
391                type == DCCP_PKT_RESPONSE;
392 }
393 
394 static inline int dccp_packet_without_ack(const struct sk_buff *skb)
395 {
396         const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
397 
398         return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
399 }
400 
401 #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)
402 
403 static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
404 {
405         struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
406                                                            sizeof(*dh));
407         dh->dccph_seq2 = 0;
408         dh->dccph_seq = htons((gss >> 32) & 0xfffff);
409         dhx->dccph_seq_low = htonl(gss & 0xffffffff);
410 }
411 
412 static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
413                                     const u64 gsr)
414 {
415         dhack->dccph_reserved1 = 0;
416         dhack->dccph_ack_nr_high = htons(gsr >> 32);
417         dhack->dccph_ack_nr_low  = htonl(gsr & 0xffffffff);
418 }
419 
420 static inline void dccp_update_gsr(struct sock *sk, u64 seq)
421 {
422         struct dccp_sock *dp = dccp_sk(sk);
423 
424         if (after48(seq, dp->dccps_gsr))
425                 dp->dccps_gsr = seq;
426         /* Sequence validity window depends on remote Sequence Window (7.5.1) */
427         dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4);
428         /*
429          * Adjust SWL so that it is not below ISR. In contrast to RFC 4340,
430          * 7.5.1 we perform this check beyond the initial handshake: W/W' are
431          * always > 32, so for the first W/W' packets in the lifetime of a
432          * connection we always have to adjust SWL.
433          * A second reason why we are doing this is that the window depends on
434          * the feature-remote value of Sequence Window: nothing stops the peer
435          * from updating this value while we are busy adjusting SWL for the
436          * first W packets (we would have to count from scratch again then).
437          * Therefore it is safer to always make sure that the Sequence Window
438          * is not artificially extended by a peer who grows SWL downwards by
439          * continually updating the feature-remote Sequence-Window.
440          * If sequence numbers wrap it is bad luck. But that will take a while
441          * (48 bit), and this measure prevents Sequence-number attacks.
442          */
443         if (before48(dp->dccps_swl, dp->dccps_isr))
444                 dp->dccps_swl = dp->dccps_isr;
445         dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4);
446 }
447 
448 static inline void dccp_update_gss(struct sock *sk, u64 seq)
449 {
450         struct dccp_sock *dp = dccp_sk(sk);
451 
452         dp->dccps_gss = seq;
453         /* Ack validity window depends on local Sequence Window value (7.5.1) */
454         dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win);
455         /* Adjust AWL so that it is not below ISS - see comment above for SWL */
456         if (before48(dp->dccps_awl, dp->dccps_iss))
457                 dp->dccps_awl = dp->dccps_iss;
458         dp->dccps_awh = dp->dccps_gss;
459 }
460 
461 static inline int dccp_ackvec_pending(const struct sock *sk)
462 {
463         return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL &&
464                !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec);
465 }
466 
467 static inline int dccp_ack_pending(const struct sock *sk)
468 {
469         return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk);
470 }
471 
472 int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val);
473 int dccp_feat_finalise_settings(struct dccp_sock *dp);
474 int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq);
475 int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*,
476                           struct sk_buff *skb);
477 int dccp_feat_activate_values(struct sock *sk, struct list_head *fn);
478 void dccp_feat_list_purge(struct list_head *fn_list);
479 
480 int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
481 int dccp_insert_options_rsk(struct dccp_request_sock *, struct sk_buff *);
482 u32 dccp_timestamp(void);
483 void dccp_timestamping_init(void);
484 int dccp_insert_option(struct sk_buff *skb, unsigned char option,
485                        const void *value, unsigned char len);
486 
487 #ifdef CONFIG_SYSCTL
488 int dccp_sysctl_init(void);
489 void dccp_sysctl_exit(void);
490 #else
491 static inline int dccp_sysctl_init(void)
492 {
493         return 0;
494 }
495 
496 static inline void dccp_sysctl_exit(void)
497 {
498 }
499 #endif
500 
501 #endif /* _DCCP_H */
502 

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